Emitting area limitation via scattering control in phosphor film realizing high-luminance laser lighting

Jian Xu, Lanjie Wang, Wen Gu, Zhi Jiang, Xinrong Chen, Baofu Hu, Baoli Du, Haipeng Ji, Carsten Dam-Hansen, Ole B. Jensen

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    Abstract

    One major benefit of laser lighting is the possibility to achieve very high luminance. In phosphor-converted laser lighting systems, a blue (pump) laser can be focused into a very small spot. However, after excitation of the phosphor, the white-light-emitting area usually increases considerably, which reduces the luminance parameter substantially. Herein, we design and investigate a highly scattering YAG:Ce/glass composite film with a porous microstructure. Both the glass/phosphor interfaces and the introduced pores act as scattering centers, which can confine the emission area effectively. The relationship between the spot size and the microstructure (porosity, phosphor-particle size, thickness) is elucidated. Under excitation with blue laser, the composite film shows a uniform white-light emission with high luminous efficacy (230 lm/W) and high saturation threshold (> 40 W/mm2), thus achieving a high luminous exitance of ∼1239 lm/mm2. With above excellent properties, the designed composite films show great potential for use in high-luminance laser lighting.
    Original languageEnglish
    JournalJournal of the European Ceramic Society
    Volume42
    Issue number2
    Pages (from-to)608-615
    ISSN0955-2219
    DOIs
    Publication statusPublished - 2022

    Keywords

    • Laser lighting
    • Luminous exitance
    • Composite film
    • Spot limitation
    • YAG:Ce

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